<template>
  <div>
    <div id="top" v-for="(item, index) in arr" :key="index">
      <input type="checkbox" v-model="newArr" :value="item" >
      <span>{{item}}</span>
    </div>
    <p>所选之和为：{{addFn}}</p>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      newArr:[]
    };
  },
  computed:{
    addFn(){
      return this.newArr.reduce((sum, item) => sum += item, 0);
    }
  }
};
</script>

<style>
#top{
  display:inline-block;
}
</style>